#include <gtk/gtk.h>


int main( int argc, char *argv[])
{

  GtkWidget *window;

  GtkWidget *table;
  GtkWidget *button;

  char *values[16] = { "7", "8", "9", "/", 
     "4", "5", "6", "*",
     "1", "2", "3", "-",
     "0", ".", "=", "+"
  };

  gtk_init(&argc, &argv);

  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
  gtk_window_set_default_size(GTK_WINDOW(window), 250, 180);
  gtk_window_set_title(GTK_WINDOW(window), "GtkTable");

  gtk_container_set_border_width(GTK_CONTAINER(window), 5);

  table = gtk_table_new(4, 4, TRUE);
  gtk_table_set_row_spacings(GTK_TABLE(table), 2);
  gtk_table_set_col_spacings(GTK_TABLE(table), 2);

  int i = 0;
  int j = 0;
  int pos = 0;

  for( i=0; i < 4; i++) {
    for( j=0; j < 4; j++) {
      button = gtk_button_new_with_label(values[pos]);
      gtk_table_attach_defaults(GTK_TABLE(table), button, j, j+1, i, i+1 );
      pos++;
    }
  }

  gtk_container_add(GTK_CONTAINER(window), table);

  g_signal_connect_swapped(G_OBJECT(window), "destroy",
        G_CALLBACK(gtk_main_quit), G_OBJECT(window));

  gtk_widget_show_all(window);

  gtk_main();

  return 0;
}
